Aquasafe WSL50 Pro, Instruction Manual

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If you selected the user-defined option in the setup menu, the meter will allow
only 2 point calibration.
Single point calibration should only be carried out with buffers of pH 7.00,
6.86 or 6.79, otherwise calibration will not be accepted.
Ensure that the meter is calibrated when attaching a new electrode or before
first use. DO NOT use visibly dirty calibration solution; contaminants in
solution will affect the calibration and eventually the accuracy of the
measurement.
5.2 Single Point Calibration:
5.2.1 Ensure that 1 point calibration is selected in the setup menu.
5.2.2 Rinse the pH electrode with distilled water.
5.2.3 Ensure the display shows the pH indicator, and press CAL key, the
meter shows “pH7.00/CAL” (or “6.86/CAL”, “6.79/CAL”).
5.2.4 Immerse the pH electrode in the pH7.00 (or 6.86, or 6.79) buffer
solution. The tip of the electrode must be completely submerged in the
calibration solution. Stir the solution gently to ensure homogeneity.
5.2.5
Press ENTER key, “Calibration” indicator begins flashing. Wait for the
measured value to stabilize; the display shows “END”. The meter
returns to measurement mode automatically.
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